fluorine lining gate valve

Basic introduction of plunger valve

by:Lianke Valve     2022-09-04
Plunger valve consists of valve body, valve cover, valve rod, column, hole frame, sealing ring, hand wheel and other components. When the handwheel rotates, it reciprocates through the up and down movement in the middle of the valve rod moving hole bracket. Complete the opening and closing function of the valve. Excessive fitting is used between the plunger and the sealing ring in the valve. By adjusting the flange bolts in the cover, the lateral force of the compression of the sealing ring and the outer circle sealing of the hole surface in the valve body and the plunger are realized to ensure the valve The tightness of the valve prevents external leakage, and the valve opening and closing torque is small, which can realize the rapid opening and closing of the valve. Plunger valves have a longer life than block valves and can save operation. However, the adjustment stroke is longer than that of the shut-off valve, so throttle control is more difficult than that of the shut-off valve. The plunger valve is composed of a stainless steel column plug, two upper and lower elastic sealing rings and a metal frame. The sealing effect is achieved by the close cooperation of the sealing column and the sealing ring. When the cylinder is opened and closed, the plunger moves slowly in the sealing ring, and the contact surface is hardly worn. When the cylinder is closed, the plunger is inserted into the sealing ring to cut off the flow passage. When opened, the plunger is away from the lower seal, but is built into the upper seal. Please isolate from the outside to avoid leakage. The surface of the plunger valve is machined with a high-precision cylindrical grinder. The sealing ring adopts a new type of sealing material with strong elasticity and high wear resistance. Therefore, the life of the plunger valve is increased. Structural features of the plunger valve: 1. Threaded or socket welded straight-through plunger valve 1. Flow channel: straight-through. 2. The valve body and valve cover are made of cast steel or steel castings, and the plunger, valve stem and isolation ring are made of stainless steel. The sealing ring is flexible graphite or Teflon. 3. The sealing ring and isolation ring are pressed by the connecting bolts, nuts and spring washers of the valve body and the valve cover. 4. The sealing is realized by the outer diameter of the plunger and the inner ring of the sealing ring. 5. The valve opens and closes slowly. 2. Straight-through plunger valve for welding connection 1. Flow channel: straight-through. 2. The valve body and valve cover are made of cast steel. 3. Other structural features are the same as those of serial number 3. Flange connection straight-through plunger valve 1. Flow channel: straight-through. 2. The valve body and valve cover are made of cast steel or steel castings, and the plunger, valve stem and isolation ring are made of stainless steel. The sealing ring is flexible graphite or Teflon. 3. The sealing ring and isolation ring are pressed by the connecting bolts, nuts and spring washers of the valve body and the valve cover. 4. The sealing is realized by the outer diameter of the plunger and the inner ring of the sealing ring. 5. The opening and closing speed of the valve is slow 4. Flange connection pressure balance straight-through plunger valve 1. Flow channel: straight-through type. 2. The valve body and valve cover are cast steel parts: the valve stem, plunger and isolation ring are stainless steel; the sealing ring and packing are flexible graphite or PTFE; the valve stem nut is copper alloy. 3. The sealing ring and isolation ring are pressed by the connecting bolts, nuts and spring washers of the valve body and the valve cover. 4. Sealing is achieved by the outer diameter of the plunger and the inner diameter of the sealing ring. 5. The plunger is hollow, with through holes in the upper and lower chambers, and the valve stem is connected with an upper sealing sleeve and a nut, so that the pressure of the upper and lower chambers of the plunger is balanced and labor is saved when opening and closing. However, the valve stem must have an upper seal and a packing seal. 6. The valve opens and closes slowly. 5. Globe-shaped plunger valve 1. Flow channel: straight-through type. 2. The valve body, valve cover and plunger body are cast steel; the valve stem and plunger pressure ring are stainless steel; the sealing ring and packing are flexible graphite or PTFE. 3. A stainless steel bushing is inlaid at the joint between the valve body and the plunger sealing ring. 4. The sealing ring is pressed on the plunger body with the plunger pressing ring. 5. The sealing is realized by the cooperation between the outer diameter of the plunger sealing ring and the inner diameter of the valve body bushing. 6. The valve body and bonnet are connected with bolts, and gaskets are used for sealing. 7. The valve stem is sealed with packing and upper seal, and the sealing can be achieved by pressing the packing. 8. The valve stem nut is used for stem transmission, and the valve can be opened and closed by rotating the handwheel. 9. The plunger valve of this structure has a faster opening and closing speed than the conventional plunger valve. This is some simple introduction of plunger valve, if you have any questions, you can consult Lianke Valve Co.,Ltd., contact: +86-577-8585 9626.
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